摘要:
Phosphorous-modified organosilicon compounds containing silicon-bound methoxy groups and a methylene spacer linking silicon to the phosphorous moiety are easily prepared in high yield and exhibit excellent hydrolysis rates. The compounds are useful, inter alia, as stabilizers in anti-freeze compositions, as cohydrolysis reactants in preparation of modified silicone resins, and in coatings.
摘要:
Composites of a fluoropolymer and an organopolysiloxane/polyurethane/polyurea adhesive exhibit strong adhesion while also offering desirable handling properties.
摘要:
The present invention relates to a device for current measuring in power supply networks comprising transformers for measuring current, a signal processing apparatus arranged on a printed circuit board and screw fastenings for mounting the device. The cable ducts of the transformers are orientated parallel to the plane of the printed circuit board, which has openings flush to the cable ducts, and the screw fastenings are fastening tabs with mounting holes, spaced so standards-compliant mounting is possible. In an alternate embodiment, the cable ducts are orientated perpendicularly to the plane of the printed circuit board, the screw fastenings are constructed as an angle rail with cable outlets and standards-compliant mounting holes, and the printed circuit board is internally fastened on one side of the angle rail. In another alternate embodiment the transformers are installed with the printed circuit board in a common housing with fastening tabs and standards-compliant mounting holes.
摘要:
Mono-hydroxyl-functional organopolysiloxanes are prepared with minimal byproducts and increased storage stability by reaction of cyclotrisiloxanes with sil(ox)anols containing less than 1 weight percent water in the presence of heterogenous alkali metal or alkaline earth metal oxide or carbonate catalysts.
摘要:
Both flexible and rigid foams may be prepared by reacting di- or polyisocyanates with organopolysiloxanes which are prepared by reaction of silanol-terminated organopolysiloxanes with organosilicon compounds containing alkyleneoxy or alkylenamino groups bonded on both ends to silicon, thus resulting in organopolysiloxanes having 95% or more of aminoalkyl or hydroxyalkyl terminal groups.
摘要:
Surface-modified solids bearing groups of the formula I SiR12—R—NH2 (I), are prepared by reacting a solid having OH groups on a surface thereof with a cyclic silazane of the general formula II where R is a divalent optionally substituted hydrocarbon radical optionally containing heteroatom containing groups, and R1 is a hydrogen atom, or a monovalent optionally substituted hydrocarbon or hydrocarbonoxy group optionally containing heteroatom-containing groups. The surface-modified solids are preferably metal oxide particles. Such surface-modified particles are useful in numerous products.
摘要:
The invention relates to a method and a device for determining a maximum leakage current in unearthed power supply networks with a plurality of conductors. The method comprises the steps of: feeding of a measurement signal UP with a measurement frequency fPuls into a conductor arrangement, setting the measurement frequency fPuls, measuring a line-to-line voltage UL-E for each conductor, determining a maximum occurring line-to-line voltage UL-Emax from the measured line-to-line voltages UL-E, determining a voltage UZe across a measurement resistance RM for calculating a leakage impedance ZE, calculating the leakage impedance ZE, and calculating a maximum leakage current THC. The device comprises a signal generator for feeding in the UP with the fPuls, a network coupling circuit between the signal generator and the conductor arrangement, a voltage measuring circuit for measuring the UL-E, and an impedance measuring circuit for determining the Ze by means of the determining of the UZe.
摘要:
Photovoltaic modules are prepared by laminating an active device to a glass cover plate by means of a thermoplastic siloxane copolymer. The siloxane copolymer provides good adhesion, freedom from water absorption, and yet can be reworked either in the field or during recycling of the solar cell components.
摘要:
Thermoset polymer systems are toughened without compromising other polymer properties by including 0.5 to 50 weight percent of 0.001 to 0.4 μm monodisperse core/shell polymers having at least an inner core of a silicone polymer and an outer core of organopolymer.
摘要:
Redispersible core/shell elastomeric particles are prepared by a process wherein a silicone elastomer core is covered with a second silicone shell, followed by an organic polymer shell.